Early-est:     Loyalty Islands    2026.09.27-01:18:29.13    q:C      mb:4.8*    Mwp:-    Mwpd:-    Td*T50Ex:-     fmamp_polarity:./hypo.1790471907402.mech.fmamp_polarity.thumb.jpg     fmamp_polarity_waveform:./hypo.1790471907402.mech.fmamp_polarity_waveform.thumb.jpg     hash:./hypo.1790471907402.mech.hash.thumb.jpg

Automatic solution - this event has not been reviewed by a seismologist
Automatically determined event information may be incorrect!

Earthquake Details:
Magnitude: mb: 4.8* [12]    Mwp: - [0]    Mwpd: - [0]
Region: Loyalty Islands
Origin Time: 2026.09.27-01:18:29.13 UTC
Hypocenter: lat: -21.45°  lon: 168.38°  [+/-24km]    depth: 5km  [+/-15km]
Location Quality: qualityCode:  C     stdErr: 2.9s   assocPhases: 61   usedPhases: 35
minDist: 0.3°   maxDist: 152.7°   AzGap: 161°   2ndAzGap: 189°   atten: -0.80 [+/-0.43]
Location Uncertainty: 68%ConfEllipse:   minHorUnc: 14km   maxHorUnc: 24km   azMaxHorUnc: 38°
68%ConfEllipsoid:   semiMajorAxisLength: 30km   majorAxisAzimuth: 218°   majorAxisPlunge: 5°   semiIntermediateAxisLength: 17km   intermediateAxisAzimuth: 128°   intermediateAxisPlunge: 3°   semiMinorAxisLength: 15km
Tsunamigeneic Assesment:
Discriminants: Prob Underwater: >99%
T50Ex: 0.3 [8]    Td: -s [0]    Td*T50Ex: - [0]    To: 1.5s [7]
Closest plate boundaries:
   New Hebrides / Australia [subduction zone]: distance: ~60km
Subduction geometry: none or not available
Decision table (TEST!):
Event type: Subduction Zone Other Thrust/Normal Strike-slip
Compatible close plate boundary?:
 YES (60km)
 no
 no
Prob underwater:
 >99%
 >99%
 >99%
Td*T50Ex:
   -
   -
   -
Td*To:
     -
     -
     -
Mwp magnitude:
       -
       -
       -
Hypocenter depth:
       5km
       5km
       5km
Slab depth at epicenter:
       n/a
       -
       -
Tsunami and Rupture predictions (TEST!): No prediction: Event too small (Mwp<7.0) or too few Mwp readings (N<20)
./hypo.1790471907402.map.jpg

First-motion Focal Mechanism (FMAMP_POLARITY):    (Warning: Unreliable solution, qualityCode=C)
Nodal Plane 1: strike: 11°   dip: 20°   rake: 163°
Nodal Plane 2: strike: 117°   dip: 84°   rake: 71°
Quality: azimuthalGap: -1°   stationPolarityCount: 17   misfitWeightCount: 6.1   misfit: 0.10   stationDistributionRatio: 0.53   meanDistP: 44.7   meanDistT: 46.1   qualityCode: C
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity
./hypo.1790471907402.mech.fmamp_polarity.mechanism.jpg
First-motion Focal Mechanism (FMAMP_POLARITY_WAVEFORM):    (No solution available)
Nodal Plane 1: strike: 0°   dip: 0°   rake: 0°
Nodal Plane 2: strike: 270°   dip: 90°   rake: 90°
Quality: azimuthalGap: -1°   stationPolarityCount: 0   misfitWeightCount: -1.0   misfit: -1.00   stationDistributionRatio: -1.00   meanDistP: -1.0   meanDistT: -1.0   qualityCode: X
Method: methodID: smi:net.alomax/focalmec/fmamp_0.0.5X_2016.06.14/_polarity_waveform
./hypo.1790471907402.mech.fmamp_polarity_waveform.mechanism.jpg
First-motion Focal Mechanism (HASH):    (No solution available)
Nodal Plane 1: strike: 999°   dip: 99°   rake: 999°
Nodal Plane 2: strike: 324°   dip: 13°   rake: 135°
Quality: azimuthalGap: 245°   stationPolarityCount: 12   misfit: 0.99   stationDistributionRatio: 0.00   rmsAngDiffAccPref: 0.00   fracAcc30degPref: 0.00   qualityCode: E
Method: methodID: smi:gov.usgs/focalmec/HASH_1.2
./hypo.1790471907402.mech.hash.mechanism.jpg

Event ID: smi:alomax.net_BETA/author/ee/event/1790471907402
Event info last updated: 2026.09.27-02:17:01 UTC
Event first association/location: 2026.09.27-01:25:02 UTC
Software: Early-est 1.2.10 (2024.02.23)
Agency: alomax.net_BETA